﻿<!DOCTYPE html>
<html>
<head>
  <title>State Chart with Draggable Node Labels</title>
  <!-- Copyright 1998-2021 by Northwoods Software Corporation. -->
  <meta name="description" content="Allow the user to shift the label of a node." />
  <meta name="viewport" content="width=device-width, initial-scale=1">

  <script src="../release/go.js"></script>
  <script src="NodeLabelDraggingTool.js"></script>
  <script src="../assets/js/goSamples.js"></script>  <!-- this is only for the GoJS Samples framework -->
  <script id="code">
    function init() {
      if (window.goSamples) goSamples();  // init for these samples -- you don't need to call this
      var $ = go.GraphObject.make;  // for conciseness in defining templates

      myDiagram =
        $(go.Diagram, "myDiagramDiv",  // must name or refer to the DIV HTML element
          {
            // have mouse wheel events zoom in and out instead of scroll up and down
            "toolManager.mouseWheelBehavior": go.ToolManager.WheelZoom,
            // support double-click in background creating a new node
            "clickCreatingTool.archetypeNodeData": { text: "new node" },
            // enable undo & redo
            "undoManager.isEnabled": true
          });

      // install the NodeLabelDraggingTool as a "mouse move" tool
      myDiagram.toolManager.mouseMoveTools.insertAt(0, new NodeLabelDraggingTool());

      // when the document is modified, add a "*" to the title and enable the "Save" button
      myDiagram.addDiagramListener("Modified", function(e) {
        var button = document.getElementById("SaveButton");
        if (button) button.disabled = !myDiagram.isModified;
        var idx = document.title.indexOf("*");
        if (myDiagram.isModified) {
          if (idx < 0) document.title += "*";
        } else {
          if (idx >= 0) document.title = document.title.substr(0, idx);
        }
      });

      // define the Node template
      myDiagram.nodeTemplate =
        $(go.Node, "Spot",
          { locationObjectName: "ICON", locationSpot: go.Spot.Center },
          new go.Binding("location", "loc", go.Point.parse).makeTwoWay(go.Point.stringify),
          { selectionObjectName: "ICON" },
          // define the node primary shape
          $(go.Shape, "RoundedRectangle",
            {
              name: "ICON",
              parameter1: 10,  // the corner has a medium radius
              desiredSize: new go.Size(40, 40),
              fill: $(go.Brush, "Linear", { 0: "rgb(254, 201, 0)", 1: "rgb(254, 162, 0)" }),
              stroke: "black",
              portId: "",
              fromLinkable: true,
              fromLinkableSelfNode: true,
              fromLinkableDuplicates: true,
              toLinkable: true,
              toLinkableSelfNode: true,
              toLinkableDuplicates: true,
              cursor: "pointer"
            }),
          $(go.Shape,  // provide interior area where the user can grab the node
            { fill: "transparent", stroke: null, desiredSize: new go.Size(30, 30) }),
          $(go.TextBlock,
            {
              font: "bold 11pt helvetica, bold arial, sans-serif",
              editable: true,  // editing the text automatically updates the model data
              _isNodeLabel: true,
              cursor: "move"  // visual hint that the user can do something with this node label
            },
            new go.Binding("text", "text").makeTwoWay(),
            // The GraphObject.alignment property is what the NodeLabelDraggingTool modifies.
            // This TwoWay binding saves any changes to the same named property on the node data.
            new go.Binding("alignment", "alignment", go.Spot.parse).makeTwoWay(go.Spot.stringify)
          )
        );

      // unlike the normal selection Adornment, this one includes a Button
      myDiagram.nodeTemplate.selectionAdornmentTemplate =
        $(go.Adornment, "Spot",
          $(go.Panel, "Auto",
            $(go.Shape, { fill: null, stroke: "blue", strokeWidth: 2 }),
            $(go.Placeholder)  // this represents the selected Node
          ),
          // the button to create a "next" node, at the top-right corner
          $("Button",
            {
              alignment: go.Spot.TopRight,
              click: addNodeAndLink  // this function is defined below
            },
            $(go.Shape, "PlusLine", { desiredSize: new go.Size(6, 6) })
          ) // end button
        ); // end Adornment

      // clicking the button inserts a new node to the right of the selected node,
      // and adds a link to that new node
      function addNodeAndLink(e, obj) {
        var adorn = obj.part;
        e.handled = true;
        var diagram = adorn.diagram;
        diagram.startTransaction("Add State");

        // get the node data for which the user clicked the button
        var fromNode = adorn.adornedPart;
        var fromData = fromNode.data;
        // create a new "State" data object, positioned off to the right of the adorned Node
        var toData = { text: "new" };
        var p = fromNode.location.copy();
        p.x += 200;
        toData.loc = go.Point.stringify(p);  // the "loc" property is a string, not a Point object
        // add the new node data to the model
        var model = diagram.model;
        model.addNodeData(toData);

        // create a link data from the old node data to the new node data
        var linkdata = {
          from: model.getKeyForNodeData(fromData),  // or just: fromData.id
          to: model.getKeyForNodeData(toData),
          text: "transition"
        };
        // and add the link data to the model
        model.addLinkData(linkdata);

        // select the new Node
        var newnode = diagram.findNodeForData(toData);
        diagram.select(newnode);

        diagram.commitTransaction("Add State");

        // if the new node is off-screen, scroll the diagram to show the new node
        diagram.scrollToRect(newnode.actualBounds);
      }

      // replace the default Link template in the linkTemplateMap
      myDiagram.linkTemplate =
        $(go.Link,  // the whole link panel
          { curve: go.Link.Bezier, adjusting: go.Link.Stretch, reshapable: true },
          new go.Binding("points").makeTwoWay(),
          new go.Binding("curviness", "curviness"),
          $(go.Shape,  // the link shape
            { strokeWidth: 1.5 }),
          $(go.Shape,  // the arrowhead
            { toArrow: "standard", stroke: null }),
          $(go.Panel, "Auto",
            $(go.Shape,  // the label background, which becomes transparent around the edges
              {
                fill: $(go.Brush, "Radial",
                  { 0: "rgb(240, 240, 240)", 0.3: "rgb(240, 240, 240)", 1: "rgba(240, 240, 240, 0)" }),
                stroke: null
              }),
            $(go.TextBlock, "transition",  // the label text
              {
                textAlign: "center",
                font: "10pt helvetica, arial, sans-serif",
                stroke: "black",
                margin: 4,
                editable: true  // editing the text automatically updates the model data
              },
              new go.Binding("text", "text").makeTwoWay())
          )
        );

      // read in the JSON-format data from the "mySavedModel" element
      load();
    }

    // Show the diagram's model in JSON format
    function save() {
      document.getElementById("mySavedModel").value = myDiagram.model.toJson();
      myDiagram.isModified = false;
    }
    function load() {
      myDiagram.model = go.Model.fromJson(document.getElementById("mySavedModel").value);
    }
  </script>
</head>
<body onload="init()">
<div id="sample">
  <div id="myDiagramDiv" style="background-color: whitesmoke; border: solid 1px black; width: 100%; height: 400px"></div>
  <p>
    This sample is a modification of the <a href="../samples/stateChart.html">State Chart</a> sample
    that makes use of the NodeLabelDraggingTool that is defined in its own file, as <a href="NodeLabelDraggingTool.js">NodeLabelDraggingTool.js</a>.
  </p>
  <p>
    Note that after dragging a node label you can move that node and the label maintains the same position relative to the node.
    That relative position is specified by the <a>GraphObject.alignment</a> property, used by the "Spot" <a>Panel</a>.
    This sample also saves any changes to that property by means of a TwoWay <a>Binding</a>.
  </p>
  <button id="SaveButton" onclick="save()">Save</button>
  <button onclick="load()">Load</button>
  Diagram Model saved in JSON format:
  <br />
  <textarea id="mySavedModel" style="width:100%;height:300px">
{ "class": "go.GraphLinksModel",
  "nodeKeyProperty": "id",
  "nodeDataArray": [
    { "id": 0, "loc": "120 120", "text": "Initial" },
    { "id": 1, "loc": "330 120", "text": "First down" },
    { "id": 2, "loc": "226 376", "text": "First up" },
    { "id": 3, "loc": "60 276", "text": "Second down" },
    { "id": 4, "loc": "226 226", "text": "Wait" }
  ],
  "linkDataArray": [
    { "from": 0, "to": 0, "text": "up or timer", "curviness": -20 },
    { "from": 0, "to": 1, "text": "down", "curviness": 20 },
    { "from": 1, "to": 0, "text": "up (moved)\nPOST", "curviness": 20 },
    { "from": 1, "to": 1, "text": "down", "curviness": -20 },
    { "from": 1, "to": 2, "text": "up (no move)" },
    { "from": 1, "to": 4, "text": "timer" },
    { "from": 2, "to": 0, "text": "timer\nPOST" },
    { "from": 2, "to": 3, "text": "down" },
    { "from": 3, "to": 0, "text": "up\nPOST\n(dblclick\nif no move)" },
    { "from": 3, "to": 3, "text": "down or timer", "curviness": 20 },
    { "from": 4, "to": 0, "text": "up\nPOST" },
    { "from": 4, "to": 4, "text": "down" }
  ]
}
  </textarea>
</div>
</body>
</html>
